We are aware of an issue where valid postcodes are being marked as invalid when registering for the 5 app. We are working to resolve this.
What to you can do
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You can register without a postcode.
Simply leave the postcode field blank and continue creating your account. -
To add your postcode, register at activate.channel5.com instead.
Ignore the code pairing step. Once registered, your postcode will be linked to your account.